Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc52790d6df6997d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 02:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5ad39ec13b5219610bcf1dc904ce921 SHA-1: 58f4ec9d900f6be1e390f32c46be90b9f40d3d43 SHA-256: dc52790d6df6997dc3e6235b8aaf511d5bee45d6f9334f6d2d8b81f55a1b79ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites that appear to be compromised or used for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nepaltrekkinginhimalaya.com/assets/userfiles/files/vifilale.pdf In PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/radijimizariwidebelati.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/dofegejawovemuj.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/xoluruniwuvezaribib.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/28719049176.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/busivulifub.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161449f913da34---kofufogipevovusadixir.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/veporasak.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/mabemimekazop.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/97221102749.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/510a3795ed22bb7dc32b5040738c9f88/filategigowijaturimimet.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/mezorizilupovejopinewoke.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/5590034998.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/jokirifurodu.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/pibijiri.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/84380028486.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/puzopapofipufiliwadep.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/wekejagitejejisa.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/liv6jfo02u6qse11p2tkf94f4p/fenedizejebilito.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614059a2a89de---83014151873.pdfIn PDF document text
    • https://verner.lt/images/files/89729407682.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210911174706.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/57023239050.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/63296604386.pdfIn PDF document text
    • https://qnzar.com/files/12222077141.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/luredepemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dawn+of+zombies+mod+apk+android+1PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 10944 bytes
SHA-256: 1cd13c80ed9dbfc79c473c4f9e2a1b549dd1d7c18baefea99ba8f4437c2f8f64
font_02_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 17148 bytes
SHA-256: b9e82c1f86faec2a7b8b10fef55f667a1f12de68a13c1db182fdc43da5f96abf

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